Can't say as I've EVER seen an unmolested PA RC this old, and still in this good of shape!!! :o
http://pittsburgh.craigslist.org/cto/4501359728.html
(http://images.craigslist.org/01414_8uq50TnGU87_600x450.jpg)
That's a rural area, near the state line. I suspect they do NOT salt the roads there - certainly not like they do here in the city - which may be why it's so well-preserved.